I have heard that after Ironman 3, Thor 2, and Captain America 2 there are plans for The Avengers 2 which will also star the most recent Spiderman (Andrew Garfield) and Wolverine (of course, by Hugh Jackman). Also there could be a few more releases with Mark Ruffalo as The Hulk. He signed a contract to star in 6 movies as The Hulk.